The value of the expression is 17. Therefore option C is the correct answer.
The given expression is 2x²-1.
We need to find the value of expression when x=3.
How to find the value of an expression?
To evaluate an expression, we substitute the given number for the variable in the expression and then simplify the expression using the order of operations.
Substitute x=3 in 2x²-1.
That is, 2(3)²-1=17
The value of the expression is 17. Therefore option C is the correct answer.
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